278 Rydberg: Studies on the Rocky Mountain Flora 



specimens 



& 



thus asperrimiim Greene) than that of E. asperum. The present 

 species is also less densely and more finely strigose than either 

 of them. E. alpestre grows at an altitude of 2500 m. or more. 



Colorado : Headwaters of Pass Creek, 1900, Rydberg & Vree- 

 land, 6200 (type); mountain near Veta Pass, 6199 ; Veta Moun- 

 tain, 6197; tributary of Turkey Creek, 6198 ; East Indian 

 Creek, 6196; Ojo, 6202; Bald Mountain, near Pikes Peak, 

 1896, E. A. Bessey. 



J Draba aureiformis sp. nov. 



1 



A slender grayish stellate plant with perennial tap-root : stem 

 strict, 2-4 dm. high, simple or branched above, with slender erect 

 branches : basal leaves spatulate, 2-3 cm. long, acute, entire : 

 stem-leaves closely sessile, oblong-lanceolate, acute, entire or 

 sinuately denticulate : petals sulphur yellow, 3-4 mm. long, 

 broadly spatulate : pedicels ascending : pod erect, linear-oblong- 

 lanceolate, 10-15 mm - l° n g> about 3 mm. wide, slightly if at all 

 twisted, stellate : style about 1 mm. long. 



This species is nearest related to D. aurea, but characterized 



by the small light yellow petals, the slender style, the less dense 



pubescence, and slender stem. It grows in dry soil at an altitude 



of 2700-3300 m. 



Colorado : Headwaters of Pass Creek, 1900, Rydberg & Vree- 

 land, 61 57 (type); Middle Park, 1861, C C. Parry, 103 ; Gray- 

 mount, 1885, G. W. Letter man, 28. 



• Physaria vitulifera sp. nov. 



A densely tufted finely stellate-pubescent perennial with deep 

 tap-root. Basal leaves numerous, fiddle-shaped, the larger 4-5 

 cm. long ; terminal lobe nearly orbicular to broadly obovate, sub- 

 entire, obtuse ; upper sinuses rounded : lateral lobes 1-2 pairs, 

 much smaller : stems ascending, or decumbent, 1-2 dm. high : 

 stem-leaves 1-2 cm. long, obovate or oblanceolate, entire : ped- 

 icels short, usually curved in fruit : sepals about 4 mm. long, ob- 

 long, acute : petals clawed, 8-9 mm. long : fruit obtuse at the 

 base, deeply divided above ; cells much inflated, round-obovate, 

 divergent, about 5 mm. in diameter : style about 5 mm. long. 



This species, as well as the two following, differs from P. didy- 

 mocarpa in the smaller fruit, which is divided only above, not at 



